Rheostat



l. GRANZ.

HHEOSTAT.

APPLxcATmN mio APR. 11. 921.

Patented Oct. 31, 1922.

more

PATE-Nr orifice.

JOSEPH GRANZ, OF DULUTH, MINNESOTA.

Application led April 11,

1 'ola ign/rom may concern.'

Be it knojivnthat I, J osErfH GRANZ, a citi` zeriofl CiehoeSlovakia, and a resident of Duliiti; in the county of StLouijSiaie of Minnesota, have,v invent'edhcefrtaiu new' and usefulurnp'rjoy'enients in'Rheo'stals. of which tlll'hfllvifving'is, s ,e'cificatiou 5V llisiiriiferitionf're lates morel particularly toitiliat typewoffrheostats used 1u connectionA itfie smaller 'for'rnsof electricnotrs Van the like'ltoucntrolfthe operation ofv hiel .Seelteurilhe present. unpr'oreriist has fr @steuert p'rogitle [Structural germanien and :1s- 599%?191aiJfleiiiesetlpegtSl, ,'irhg'ebi. the; fea te .are @filament have infie# al er .-Ihghy @eine :efectuar zs'pf po'rtleiil11% a small;and4 compf'agct compass' al'yerx iejfliciexnt ie'liipofsu're,F to p'errnilt ,the fes? capaci lgieat4 from' such resistance 'Wire' d'url use.

,1. @Lilie ampie andere@ .cortarte tion' antl'ai'rangementof parts" 'whereby the' frictional stress of the adjustable contact shoe lupon"thefrefsistance Windingduring fan adjusting operation can be materially reliei'edtjighile:electric contactfis still'maintaiiiedgalltflas will. hereinafter more fully ear-i i 11 'iH 4 latheA vaccompanying drawings 2 'glh'is a'front 'elevation of the present rheostat'jvstrueture.

Ii'g. 2,'A is asectional elevation on line 2,'-"-2 Eigf.

Fig;;' "3. is a similar view on lineA 3,-3 Flgv5;v4

is a fragmentary elevation of the ineffable contact shoe, resistance element and accesstirylparts and showing in 4dotted lines therlco'ntact'shoe in a tilted or released condition;

l{Fig '5; is a transverse sectional elevation on line 5-5, Fig. 2.

6, is a central transverse section on lin'eGQ-YTG Fig. l.

Like reference numerals parts' in the several views.

Referringr to the drawings'. l and L) desigriate counterpart marginally flanged heads between which an oriired c rlindl'ical shell Il is arranged to contsitnle the ventilated en closing housing of the present structure.

l designates a har or strip ot' insulatingr material fixed to the rearward housing hczul 2, and adapted to support (he resistance element. terminal posts and other parts` of indicate like 1921. seal No. 460,464.

the appllance in proper insulated rei-anon asuliereinafter described in detail.

idesilgnates the inner and main supportiii'gfinember, or core of the resistance member whichv in the present construction is o fl an op'en v skeleton construction and consstsfoffiafpair'of 'llat late metal sections off'asplit ringshape' as s Vown in Figs. 2 and 3,' secure'djtogether in properly separated relatioufbya'series Vof vconnecting posts or stlfld' V6`,"."'\ritli`A the inner plate metal sectionf'atta'zliedj' to .the aforesaid insulating bal-ersi'rpa 'ifyis'rws or other like fas. n'n'ii n'sissiiewhifrlrigsf 3 and 5, i@ a'ifoxlftlli 1isole;supporting means for the resistaenieriiberarid associated parts.

rfi', and I8.designate theterminal or binding postsoffthe'fappfliance andlwhich preferably formfextensions of the fabove mentioned attachinfscew's'lby whichtlie inner plate inetiilise'ction'i'islsecurecl in place. Une of sad. terminal posts 7 is in direct Velectrical cone'ctori' rir'ith: said 'inner plate'rnember, wh'ilefthe other-terminal post8 has insulated relation to. said 'plate member by means ofen -insulating Washer or bushing ofthe'usual form'.

9,' designates coverinv layers or sheets of insulating vinate'lial "o a flat ring shape coire'spondinfrwi'th' the inner plate metal sections 51o ,theiesistance member with each .plate metal section haring an indi- \"idi1al"layer orsh'eet 9, and with each sheet or. la er 9 provided with inside and outside'v ganges'or rims 10 and adapted to enclosetlie edges o fzan associated plate metal sectioni v'and' :prevent electric contact luetweenthe same and the resistance winding liereinafterdescribed. In the present conY struction as shown in Fig. 6, the sheets or layers 9 are'arranged respectively. upon the forward 'face ofthe outermost plate metal section '5Y,"'and upon the rear face of the innermost plate metal section 5.

' 1L designates the resistance winding. .mich in the present construction comprises wire wound around the insulating supporting member or core above described. with its respective ends in electrical connection with the terminal posts T and S.

l2 designates a sector shape plate or bridge fixedli' secured to a plate metal sertion 5 and etendingr inwardly to the center' of the appliance to provide support l'or the adjustable contact number.

'l designates a. journal hushin*l llxedlj.'

(i il lll?) lll) f o Spring 17. mongool?.

cured to the plate or bridge 12 in .central relation to the other parts "of the appliance and 'formed :1t its outer end with a interni sector shaped Shop lug l man ed in .the mth of the hereinafter describe vcarrying arm ol the movable contact member, to limit l the turning movement of the Asauge in either direction.

l5 designates the efrrying geeft ,of the. movable contgot'inembex" ,of the Appliance, pro-vided with" .elifporoiing ,handle 1 6 Mono end, and arraiigolto havo .a turning' moromeni; -in the here ofthe bushing llend in oddiliorsi .a limited Slidinginoroihoni in .said boro iioh ,sliding moiioment .oiootod l.

0f atnaguler religies, hmepivotelly mounted qu the .outer er. .p erm 1 9, with one of its ilatfacefe ,to here extended slidmg Contact with Wimiingsof resisten@ .wire 1 1 4elgliue l .2.1 .designates o spring esspoioioii .the Shoo 20 @ns1 in its #111119, with 'iilondoiioyto import o"ti1tog.mifmn .W .eid Slioofos illustrated in; dotted lines u1 {Eig-.$5.0 that when the oarryiiig ,orio ,19 au o soooioiod parts oro drown oom-ord .by .tho operator as above :set forth2 one end o f the..sl 1oe20 will be maintained in electrical rcontact with .the resistance .winding 11 4by the influence .of said spring.-

.Having thus fully described my said. invention .what Lclnim n s new and desire to secure by Letters Potent, is.:F

' 1. In n uheostat, ,the Voomliirnztion of .an enclosing housing, an insulating base secured \\1tl1inthe.s|uue, e reslstancesupport secured to seid hose and eoinpri i p. pair of oore pluies of 1 4split :ring fox-n attached together .ilrspuoed relationp. .winding of re. sistunce wire .wound -upon .end .from .one to the other of said com P lfltesnitnd a centrally pivoted erm cnrry Aat tsuterendu contact shoe adagted r bearing upon said wil'e Winding.

2. In .e rheostatthe comhinetionof enclosing housing, un insulating `,buse secured within the sume. e resslanoe-su|pportsecurecl to said has@ and comprising e -pziir o f core News of :i split ring form attached together in spaced reletion, 4each:croreplilte cop'sistin of an inner rigid core plate ami an insulate cover plate, a, winding of resistance wire eneircling .seid wropletes, and a centrally pivoted erm carrying at its outer end u conihe't-hoe adapted for bearing upon seid wire .i'iiidilie- "3.'It1'iiirh5statg the combination of an enclosin housing, nn iiieulutingrlgpsg Cured Within thooomo, oioistiiiioofsuproit Sooureil'tooiid fbeoo oid ooiiuiiuiiig if Piir oioorlo'rlotoo ofo Split ring 'f oiilo otteohofl togotiior ,iospaood iol-ation; oiioli o oioiplel'o consisting of ori inner rigid Coro i111' iiisiiliiine @vor .Pluto havin@ f. inner .oudouf-e1' liliiiieoos o" .Winiii'g Sloten@ Viro, oiioiiolinesoifl ooio lolite-i," and @lill 5 "Iii .si lipstot, .olie ooiiibipotioii of enclosing housing, .en noiiletuig .beso Seoiwod witliiii the Semo, o. .reioioiioo .oop-'miti seoillecito .said bosoeud o oiiiPriSiog" o, .air of core plates ofa'. 'spilt ring formrttg Led together in, .o flood relation, o .wznolie'fof rosistfuifo .i'iio .oiioioliiig Soifi .coro P. ico a. centrally pivoted'and rsiiiglly extending mi, ii 1.triiiiigiiliir .hiipo"'.ooi.iioot i.. pivotally moun'tecl ou the outer end' pfrigl e1m,-imd :ii .spring .tonding to tilt 'orio 'ood of said shoe towards said `Wire winding."

,6. In i rheoiitat, ,the `combination olf en enclosing housing, ,lo .insulating .ooo-'o oooiirod within thotoino, .o i'ooisbeiifo .Support Ssioiirofl .to oeidbooo ood comprising ii of core plates f e splitring formtteeql togotlior iii ,Spfiooo relation., ,i wiodiog rsistance wire encircling Suid core p i .bridge Piece oiritiod .by .orio of tho' ooio plates,` `a|1 operating shaft 4jourlifalled in Suid lnidge piece in @entrai rrelation to Lthe com plates, u. radial urlo jutriiieheci to s;1id`$l1 a,flt, and acont-,ict shoe pirotellyimounteplqu.the outer end of seid erin und'gidapted for beeriugon said wire winding.

T. In .u rheostat, .the combination of :in enclosing housing, ur. insulating base Asecured -within the sume. u resistance support secured lto seid bugie und comprising a pair of c ore plates of a split ring form ttached together iu 4spuwed relation, a winding of resistance wire encircling: uid core plates,

.ofir ,split .ring toen einer .o fof lsu a bridge piece Carried by one of the core plates, a journal bushing fixed to said bridge piece in eentral relation to the core plates, an operating shaft journalled in said bushing and having limited sliding nievement therein, a spring tending to slide shaft in a direction towards the aforesaid core plates, a radial arm attached to said shaft, and a. Contact sliceJ pivotally mounted on the outer end of said arm and adapted for bearing on the wire winding of the core plates.

8. In a rlieostat, the combination of an enclosing housing, an insulating base secured within the same, a resistance support, secured to said base and Comprising a pair of core plates of a split ring form attached together in spaced relation, a Winding ot' resistance Wire envireling said plates, a, bridge pier-e Carried by one of the core plates, a journal bushing fixed to said bridge piece in central relation to the core plates and having at one end a laterally arranged stop lng, an operating shaft journalled in said bushing and having limited sliding movement therein, a spring tending to slide said shaft in a direction towards the afore said core plates, a radical arm attached to said Shaft and a Contact shoe pivotellj.T rn unted on the outer end of said erm and a apted tor hearing on the Wire winding of the core plates.

Signed at Duluth, Minn., this 25th day of March 1921.

JOSEPH GRANZ. 

